Method for preparing granular slow-release magnesium fertilizer by taking low-grade magnesite as raw material

A magnesite, low-grade technology, applied in the direction of magnesium fertilizer, chemical instruments and methods, magnesium sulfate, etc., can solve the problems of yellowing, affecting plant yield and quality, and achieve the effect of low temperature and high purity

Inactive Publication Date: 2018-07-06
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Magnesium is the fourth essential nutrient element, an important part of chlorophyll, and the only metal element in chlorophyll. The physiological role of magnesium in plants lies in its participation in plant metabolism. If it is insufficient, chlorophyll is difficult to produce, and plant leaves will be damaged. It will lose green and turn yellow, and photosynthesis will not proceed, which greatly affects the yield and quality of plants

Method used

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  • Method for preparing granular slow-release magnesium fertilizer by taking low-grade magnesite as raw material
  • Method for preparing granular slow-release magnesium fertilizer by taking low-grade magnesite as raw material
  • Method for preparing granular slow-release magnesium fertilizer by taking low-grade magnesite as raw material

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Experimental program
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Effect test

Embodiment approach

[0034] (1) Weigh 100 grams of low-grade magnesite powder, pour 0.01 grams of surfactant into 100 milliliters of deionized water with a pH value of 11, stir, and modify the surface for 5 minutes.

[0035] (2) The modified magnesite powder is obtained by filtration, and the mother liquor is recycled.

[0036] (3) Pour 100 grams of modified magnesite powder into a 500 ml three-necked flask, measure 100 ml of concentrated sulfuric acid with a measuring cylinder, dilute to 50% (mass ratio), 30 drops / min, and drop into the three-necked flask , start stirring at 300 rpm, heat up to 35°C-85°C, and react for 1 to 3 hours.

[0037] (4) Carbon dioxide, compressed and liquefied.

[0038] (5) Weigh 100g of magnesium sulfate heptahydrate, 0.4, 0.5, and 0.6 g of bentonite, mix them evenly, grind them, place them in a turntable, spray water to make balls, and sieve to make 1-2mm particles Magnesium fertilizer.

[0039] (6) Add a certain amount of maleic anhydride and 200ml of distilled wat...

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Abstract

The invention discloses a method for preparing granular slow-release magnesium fertilizer by taking low-grade magnesite as a raw material, and relates to a preparation method of magnesium fertilizer.The method comprises the following steps: taking the low-grade magnesite (the content of magnesium oxide is smaller than or equal to 40 percent) as a raw material, performing crushing, grinding and sieving, and minifying magnesite powder through a surfactant; ensuring that the modified magnesite powder directly performs chemical reaction with sulfuric acid, so as to produce magnesium sulfate heptahydrate, and recycling discharged carbon dioxide; combining obtained magnesium sulfate powder with a binder, and preparing granular sulfate powder according to a rotating disc process; combining the obtained granular sulfate powder with a covering agent, and preparing the granular slow-release magnesium fertilizer. According to the technical steps, the direct chemical utilization of the magnesiteis realized, and the magnesium sulfate heptahydrate is produced; double utilization of magnesium and carbon is realized, and thorough utilization of the low-grade magnesite is really achieved; directcompression and liquefaction is realized, and gas fertilizer is manufactured; zero release is realized in the whole process, and the method belongs to a green chemical technology.

Description

technical field [0001] The invention relates to a preparation method of magnesium fertilizer, in particular to a method for preparing granular slow-release magnesium fertilizer with low-grade magnesite as raw material. Background technique [0002] In the use of magnesite in China, in order to produce refractory materials, there is a problem that high-quality magnesite is over-mined and used, but low-grade magnesite or fine ore and tailings are not fully utilized. The problem of mine vegetation restoration is serious, and the comprehensive utilization of resources is not high. Not only are there few product varieties, but the product grades are also not high. [0003] So far, the chemical utilization of magnesite is only to use light-calcined magnesite as raw material after magnesite calcining, and then react with sulfuric acid or hydrochloric acid to form magnesium sulfate heptahydrate or magnesium chloride hexahydrate, and carbon dioxide is directly emitted during the cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D5/00C05D7/00C01F5/40C01B32/50
CPCC01F5/40C05D5/00C05D7/00C05G5/37
Inventor 王国胜赵昕昕韩思宇张春张本贵谢英鹏聂鑫
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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